Improvement in hot-air furnaces



Z-SheetsSheet1. L. R. COM-STOCK.

HOT AIR FURNACE. No.175,854. Patented A'pr'i111.1876.

WWITJVESSES J INVENTOR M flttorneys.

Z Sheets-Sheet Z.

L. R. COMSTOCK. HOT AIR FURNACE.

Patented April 11, 1876.

M V'EJV' TOR By -/Itt0rneys N.FETERS. FHDTOI-LITHOGRAPHER, WASHINGTON. D(Jv Pn'rnlvr rr.rcn.

- Levin. OOMSTOCK, or RICHMOND, VIRGINIA.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No.

175,854, dated April 11, 1876; application filed August 14, 1875.

To all whom it may concern;

Be it known that I, LEVI R. OoMsTocK, of Richmond, in thecounty ofHenrico and State of Virginia, have invented a new and valuableImprovement in Heaters; and I do hereby declare that the'following is afull, clear,and exact description of the construction and operation ofthe same, reference being had to the annexed drawings, making a part ofthis specification, and to the letters and figures of reference markedthereon.

Figure 1 of the drawing. is a representation of a vertical centralsection of my heater; and Fig. 2 is a vertical central sectional detailview thereof. Fig. 3 is a horizontal sectional view of the same.

This invention has relation to improvements in heaters; and it consistsin the novel construction and arrangement of the parts, as will behereinafter more fully set forth.

In the annexed drawings, A designates the outer metallic casing of myimproved heating device, which is designed to be inclosed within asuitable brick-Work sheathing. The upper end of this casing is closedbymeans of an annular flange, a, to the inner edges of which is secureda preferably tapering tube, B, which projects downward nearly midway ofthe length of the heater, and which is provided with a cylindricalsmoke-pipe, C, which projects upward above the casing, and is providedwith a pipe, 1), upon which the flue or smoke-conduit leading into thechimney-flue is designed to be fitted. Smoke-pipe 0 being cylindrical,and tube B in the form of a frustum of a cone, an air-chamber, c, isformed between them, which chamber is provided with a suitable metallicconduit, 0, passing through exterior metallic casing A below flange a,the object of which will hereinafter become apparent. D represents anisolated annular metallic chamber, of less diameter and height thancylindrical casing A, which is arranged inside of the latter, andsurrounded by passages, as will be hereinaftermore fully described.-Hot-air passages d d 01 are formed above, below, and on the outer sideof the isolated chamber D. This chamber is provided with a number ofspaced tubes, E E, the former of which pass upward through flange a fromthe upper wall of the said chamber, and

the latter downward therefrom through a flange, a, of correspondingshapewith flange aupon the lower end of easing A. The V- shaped tube Bprojects downward into the space between the inner walls of annularchamber D, a hot air passage, 01, being formed between them, as shown inFig. l, communicating with passages d 11 01 as shown in Fig. l. Thelower end ofa chamber, L, formed by the inner walls of chamber D, isclosed by a double convex hollow perforated damper, F, into whichatmospheric air is admitted from the exterior of the casing by means ofan elbowed pipe, G. This pipe serves as a journal for the damper,another journal being afforded by means of a crank-arm, H, on theopposite side of the said damper, as shown in Fig. 2. Below this damperis the fire-box J, into which fuel is introduced through an opening, I,closed by a hinged door, K.

' The operation of my improved heater is as follows: The damper beingclosed, the products of combustion will be carried under chamber Dthrough passage (1 between outer V casingA and the said chamber, thencethrough passage 01 overthe same, down passage 01 between tapering tube Band the aforesaid chamber, thus making an entire circuit of the same.The air to be heated passes up lower pipes E, where it is subjected tothe direct action of the flames in the fire-box, into chamber D, which,being surrounded with passages conducting the products of combustioninto smokepipe 0, increases the heat of the partially heated aircontained therein. The hot current of air then passes up through pipesE, which extend through smoke-passage at above chamber D, in which pipesthe air is, as it were, superheated, and is then ready for use forheating purposes, and may be conducted through suitable pipes to'varionsparts of the building. The products of combustion in passing downpassage 01'' into smoke-flue G raise the air contained in chamber 0,between the said flue and conical tube B, to a very high temperature, sothat it is of itself capable of warming the room of the building inwhich the heater is placed, being allowed to escape therein through pipe0. During the combustion of fuel in the fire-box atmospheric air isconducted through elbow G into the interior lowing means forcompellingthe operator to I establish a direct draft: The door is provided with ametallic bail, N, of angular form, hav-v ing a notch, n, of suitabledepth thereon. In

this notch the end of the crank-arm H of the damper F is adapted to beengaged, thus preventing the said door from being opened until thecrank-arm is raised up out of the notch. This raising up of thecrank-arm will partially rotate the damper on its bearings, and willestablish a direct draft through the fire -box J, chamber L, andsmoke-flue O, which will carry off the gases into the chimney-flue.

In order to precipitate the soot carried up chambers 01 d by the draft,I have caused spaced openings '5 to be made in flanges a at the upperpart of the heater, which openings are closed by means of detachablecaps V,

which are provided with a flange, v, upon their under sides, accuratelyfilling the said openings. These caps may be hinged to the casing,ifl soelect. When a suitable number of these openings are disclosed, a currentof cold air will descend, bearing with it the particles of soot downwardinto the fire-box J, where they will be consumed.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- 1. The hollow perforated damper F, havinga hollow journal, G, in combination with a fire-box of a heater,substantially as described, and for the purpose set forth.

2. In a heater, the combination of'the hollow perforated damper, havingthe crank-arm H, bail N, provided with a notch, n, and hinged door K,substantially as described.

In testimony that I claim the above I have hereunto subscribedmy name inthe presence of two witnesses.

LEVI RICHARDSON GOMSTOOK.

Witnesses:

CHAS. H. SMITH, I WILLIAM WYNYARD ASTELL.

